Re: ID_SERIAL for udev bluetooth joystick events

On Fri, Feb 04, 2011 at 11:34:27PM +0100, Antonio Ospite wrote:

Hi,

I have a question about udev events generated by a bluetooth joystick:
when the bt joystick generates the joystick event, the ID_SERIAL
property matches the one of the bt adapter not the one of the joystick.

For example (using "udevadm monitor --property"), when connecting the
Sony Sixaxis via usb I get:
ID_SERIAL=Sony_PLAYSTATION_R_3_Controller
in the input and joystick events, but when I connect it via bt, I get:
ID_SERIAL=Broadcom_Corp_ANYCOM_Blue_USB-200_250
which matches my bluetooth adapter.

Is this expected/known, or is it a bug?
I am using kernel 2.6.37, udev 164

For the records, I also get ID_BUS=usb when connecting via bt, but I can
live with that since I can differenciate usb and bt operation using
ID_USB_DRIVER=usbhid
versus
ID_USB_DRIVER=btusb

Some insight of what I am trying to achieve with udev:
  1. Monitor new joystick devices.
  2. If ID_SERIAL != Sony_PLAYSTATION_R_3_Controller, then STOP.
  3. Get the associated hidraw device node navigating the event tree.
  4. Set leds using the value from the ID_INPUT_JOYSTICK property.
  5. If ID_USB_DRIVER=usbhid do the needed pairing.

And with the current behaviour for ID_SERIAL I cannot enforce 2.
I could listen for the (hid) event and use HID_NAME which seems to be a
little more consistent:
usb -> HID_NAME=Sony PLAYSTATION(R)3 Controller
bt  -> HID_NAME=PLAYSTATION(R)3 Controller
and navigate the event hierarchy to get ID_INPUT_JOYSTICK, but that is
slightly more complicated, and I am curious about the ID_SERIAL
behavior anyways :)

This should be directed to udev list as composition of ID_SERIAL is
done exclusively by udev. It looks like it scans parent till it finds
first USB device (thus skipping all BT-specific data).

Thanks.

-- 
Dmitry